Solve clearly

AlphaBee's production function is given by f(k,D) =[ min(31,2k) ". AlphaBee can sell its product at $30 per unit, can hire as many workers as necessary at wage w = $15, and use as much capital as necessary at a price r = $19. It does not face fixed costs. How many units does the firm produce? Hint: First, find AlphaBee's cost function. Enter a numerical value below. You may round to the second decimal if necessary